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   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exresnte - AML Interpreter object resolution
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2007, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acdispat.h>
  47 #include <acpi/acinterp.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acparser.h>
  50 #include <acpi/amlcode.h>
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exresnte")
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ex_resolve_node_to_value
  58  *
  59  * PARAMETERS:  object_ptr      - Pointer to a location that contains
  60  *                                a pointer to a NS node, and will receive a
  61  *                                pointer to the resolved object.
  62  *              walk_state      - Current state.  Valid only if executing AML
  63  *                                code.  NULL if simply resolving an object
  64  *
  65  * RETURN:      Status
  66  *
  67  * DESCRIPTION: Resolve a Namespace node to a valued object
  68  *
  69  * Note: for some of the data types, the pointer attached to the Node
  70  * can be either a pointer to an actual internal object or a pointer into the
  71  * AML stream itself.  These types are currently:
  72  *
  73  *      ACPI_TYPE_INTEGER
  74  *      ACPI_TYPE_STRING
  75  *      ACPI_TYPE_BUFFER
  76  *      ACPI_TYPE_MUTEX
  77  *      ACPI_TYPE_PACKAGE
  78  *
  79  ******************************************************************************/
  80 acpi_status
  81 acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,
  82                               struct acpi_walk_state *walk_state)
  83 {
  84         acpi_status status = AE_OK;
  85         union acpi_operand_object *source_desc;
  86         union acpi_operand_object *obj_desc = NULL;
  87         struct acpi_namespace_node *node;
  88         acpi_object_type entry_type;
  89
  90         ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);
  91
  92         /*
  93          * The stack pointer points to a struct acpi_namespace_node (Node).  Get the
  94          * object that is attached to the Node.
  95          */
  96         node = *object_ptr;
  97         source_desc = acpi_ns_get_attached_object(node);
  98         entry_type = acpi_ns_get_type((acpi_handle) node);
  99
 100         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
 101                           node, source_desc,
 102                           acpi_ut_get_type_name(entry_type)));
 103
 104         if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
 105             (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
 106
 107                 /* There is always exactly one level of indirection */
 108
 109                 node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
 110                 source_desc = acpi_ns_get_attached_object(node);
 111                 entry_type = acpi_ns_get_type((acpi_handle) node);
 112                 *object_ptr = node;
 113         }
 114
 115         /*
 116          * Several object types require no further processing:
 117          * 1) Device/Thermal objects don't have a "real" subobject, return the Node
 118          * 2) Method locals and arguments have a pseudo-Node
 119          * 3) 10/2007: Added method type to assist with Package construction.
 120          */
 121         if ((entry_type == ACPI_TYPE_DEVICE) ||
 122             (entry_type == ACPI_TYPE_THERMAL) ||
 123             (entry_type == ACPI_TYPE_METHOD) ||
 124             (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
 125                 return_ACPI_STATUS(AE_OK);
 126         }
 127
 128         if (!source_desc) {
 129                 ACPI_ERROR((AE_INFO, "No object attached to node %p", node));
 130                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 131         }
 132
 133         /*
 134          * Action is based on the type of the Node, which indicates the type
 135          * of the attached object or pointer
 136          */
 137         switch (entry_type) {
 138         case ACPI_TYPE_PACKAGE:
 139
 140                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_PACKAGE) {
 141                         ACPI_ERROR((AE_INFO, "Object not a Package, type %s",
 142                                     acpi_ut_get_object_type_name(source_desc)));
 143                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 144                 }
 145
 146                 status = acpi_ds_get_package_arguments(source_desc);
 147                 if (ACPI_SUCCESS(status)) {
 148
 149                         /* Return an additional reference to the object */
 150
 151                         obj_desc = source_desc;
 152                         acpi_ut_add_reference(obj_desc);
 153                 }
 154                 break;
 155
 156         case ACPI_TYPE_BUFFER:
 157
 158                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) {
 159                         ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",
 160                                     acpi_ut_get_object_type_name(source_desc)));
 161                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 162                 }
 163
 164                 status = acpi_ds_get_buffer_arguments(source_desc);
 165                 if (ACPI_SUCCESS(status)) {
 166
 167                         /* Return an additional reference to the object */
 168
 169                         obj_desc = source_desc;
 170                         acpi_ut_add_reference(obj_desc);
 171                 }
 172                 break;
 173
 174         case ACPI_TYPE_STRING:
 175
 176                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) {
 177                         ACPI_ERROR((AE_INFO, "Object not a String, type %s",
 178                                     acpi_ut_get_object_type_name(source_desc)));
 179                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 180                 }
 181
 182                 /* Return an additional reference to the object */
 183
 184                 obj_desc = source_desc;
 185                 acpi_ut_add_reference(obj_desc);
 186                 break;
 187
 188         case ACPI_TYPE_INTEGER:
 189
 190                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) {
 191                         ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",
 192                                     acpi_ut_get_object_type_name(source_desc)));
 193                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 194                 }
 195
 196                 /* Return an additional reference to the object */
 197
 198                 obj_desc = source_desc;
 199                 acpi_ut_add_reference(obj_desc);
 200                 break;
 201
 202         case ACPI_TYPE_BUFFER_FIELD:
 203         case ACPI_TYPE_LOCAL_REGION_FIELD:
 204         case ACPI_TYPE_LOCAL_BANK_FIELD:
 205         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 206
 207                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 208                                   "FieldRead Node=%p SourceDesc=%p Type=%X\n",
 209                                   node, source_desc, entry_type));
 210
 211                 status =
 212                     acpi_ex_read_data_from_field(walk_state, source_desc,
 213                                                  &obj_desc);
 214                 break;
 215
 216                 /* For these objects, just return the object attached to the Node */
 217
 218         case ACPI_TYPE_MUTEX:
 219         case ACPI_TYPE_POWER:
 220         case ACPI_TYPE_PROCESSOR:
 221         case ACPI_TYPE_EVENT:
 222         case ACPI_TYPE_REGION:
 223
 224                 /* Return an additional reference to the object */
 225
 226                 obj_desc = source_desc;
 227                 acpi_ut_add_reference(obj_desc);
 228                 break;
 229
 230                 /* TYPE_ANY is untyped, and thus there is no object associated with it */
 231
 232         case ACPI_TYPE_ANY:
 233
 234                 ACPI_ERROR((AE_INFO,
 235                             "Untyped entry %p, no attached object!", node));
 236
 237                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);        /* Cannot be AE_TYPE */
 238
 239         case ACPI_TYPE_LOCAL_REFERENCE:
 240
 241                 switch (source_desc->reference.opcode) {
 242                 case AML_LOAD_OP:
 243
 244                         /* This is a ddb_handle */
 245                         /* Return an additional reference to the object */
 246
 247                 case AML_REF_OF_OP:
 248
 249                         obj_desc = source_desc;
 250                         acpi_ut_add_reference(obj_desc);
 251                         break;
 252
 253                 default:
 254                         /* No named references are allowed here */
 255
 256                         ACPI_ERROR((AE_INFO,
 257                                     "Unsupported Reference opcode %X (%s)",
 258                                     source_desc->reference.opcode,
 259                                     acpi_ps_get_opcode_name(source_desc->
 260                                                             reference.opcode)));
 261
 262                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 263                 }
 264                 break;
 265
 266         default:
 267
 268                 /* Default case is for unknown types */
 269
 270                 ACPI_ERROR((AE_INFO,
 271                             "Node %p - Unknown object type %X",
 272                             node, entry_type));
 273
 274                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 275
 276         }                       /* switch (entry_type) */
 277
 278         /* Return the object descriptor */
 279
 280         *object_ptr = (void *)obj_desc;
 281         return_ACPI_STATUS(status);
 282 }